Telephone-receiver



J. A. WOTTON.

TELEPHONE RECEIVER.

APPLICATION FILED NOV-3. my

1,337,741 Patented Apr. 20, 1920.

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y l Affy UNITED STATES PATENT OFFICE.

JAMES A WOTTON, 0F IvSIONTCLAIR, NEVJ JERSS EY,

SSIGNOR TO \VESTERN ELECTRIC COMPANY, INCORPORATED, OF NEVI YORK, N. Y.,A CORPORATION OF NEW YORK.

TELEPHONE-REGEIVEB.

l 0 (M whom it 121 coy concern Be it known that I, JAMns A. lVo'rToN, a

citizen of the United States, residing at Montclair, in the county ofEssex and State of New Jersey, have invented certain new and usefullmprovements in Telephone- Receivers, of which the following is a full,clear, concise, and exact description.

This invention relates to telephone receivers and more particularly tothose which are used as auxiliaries to the usual receiver.

In telephone systems, it is often desirable to provide an additionalreceiver which the subscriber may employ as an auxiliary to the usualreceiver in listening to telephonic conversations when the soundstransmitted to the station are difficult to distinguish. Such auxiliaryreceivers are especially clesirable for use in case the extraneousnoises surrounding the station are excessive or the quality oftransmission over the connected lines is low.

in order to provide service of this character, it has been the generalpractice to supply an auxiliary receiver usually of the watch case type,which is normally attached to the subscribers set but which may bereadily removed therefrom in case it is desired for use. While such anarrangement provides a readily accessible receiver for auxiliary use, ithas been found that when the auxiliary receiver is not in use, not onlyis the efliciency of the main receiver somewhat impaired due to thepermanent inclusion of the auxiliary receiver in parallel relationtherewith, but also objectionable howling sounds are often emitted fromthe auxiliary receiver, interfering materially with the telephonicconversation.

With a view of eliminating these difli culties, receivers of thischaracter, in some instances, have been equipped with normally openswitches mounted within, but operable from the exterior of the receiver,whereby the auxiliary receiver may be included in circuit when desired.In such cases, however, it has been found that other objectionablenoises have resulted due to the appreciable opening in the casing aroundthe operating member of the switch.

The object of the present invention is to provide a simple, compact andinexpensive receiver for this service which will overcome thedifliculties experienced in the past.

To obtain this object in accordance with Specification of LettersPatent.

Patented Apr. 20, 1920.

Serial No. 200,055.

a feature of the invention, the receiver is provided with a normallyopen switch located within but conveniently operable from the exteriorof the receiver, the operating member of such switch substantiallyclosing the opening in the casing through which it passes.

line and other features not specifically mentioned above, will moreclearly appear from the following specification and the accompanyingdrawing, in which Figure 1 is a front sectional view of a receiverembodying this invention; Fig. 2 is a side elevation in section; andFig. 3 is a perspective view of a portion of the receiver showing theswitching arrangement.

As shown in the drawing, a receiver embodying this invention comprisesthe usual shell or casing l externally threaded to receive the up 2. llithin the casing, the usual permanent magnet 3 and the electromagnets aare mounted in operative relation to the usual diaphragm 5. Upon theupper surface of the permanent magnet structure, a plate (3 ofnon-magnetic material is placed. A plate 7 is placed upon the plate 6and a bank of contact springs comprising insulating members 9, 9, 9,rigid contact member 10 and resilient contact spring 11, is mounted onthe member 7. The parts 6, 7, 9, 10 and 11 are assembled with thepermanent magnet structure by means of suitable screws 12, 12 and nuts13, 13. A. portion of the outer edge of memher 7 is formed to provide aknife edge fulcrum 14-, upon which the substantially rightangledoperating lever 15 rests. An aperture i6 is provided in the side of thecasing to permit the extension of lever 15 to the outside of the casingwhere it is spoon shaped so as to substantially conform to the contourof the casing. An insulating abutment 17 provided on the under side ofspring 11, normally presses the short arm of lever 15 against thesurface of plate 7 and thereby holds the long arm of the lever 15 awayfrom the exterior of the casing.

ll hen the long arm of lever 15 is pressed against the exterior of thecasing l, the short arm of the lever is raised from the plate 7 and as aconsequence, tie normally disengaged contacts on spring members 9 and10, are brought into engagement. Terminal lugs 18, 18 are provided onthe opposite ends of contact springs 9 and 10, which terminals may besuitably connected to so include the switch in the receiver circuit thatthe auxiliaryreceiver is brought into operative relation only while theswitch is closed.

It will be noted that in any'position of the operating lever 15 theaperture 16 in the casing lis substantially closed and that the exposedportion of the lever 15 is so shaped that it may be easily held againstthe casing during the periods in which the receiver is placed in theusual position for listening, while it does not at any time impair theappearance of the receiver.

IVhat is claimed is:

1. In a telephone receiver, an annular casing having an opening in theside thereof, a member mounted within the casing and having a knife edgefulcrum located in such opening, an operating lever resting on saidfulcrum and cooperating therewith to substantially close such openingthroughout its operation, the short arm of said lever extending withinsaid casing and the long arm thereof protruding from said casing andshaped to substantially conform to the terior of said casing, and aplurality of contacts located within said casing and controlled by theactuation of said lever.

2. In a telephone receiver, a casing having an aperture in the sidethereof, a knife edge fulcrum located within such aperture, a leverhaving a spoon shaped long arm projecting through such aperture and aflat short arm extending within said casing resting on said fulcrum andcooperating therewith to substantially -close such aperture, a rigidcontact carrying member, and a resilient contact spring carrying aninsulating abutment in ope 'atii'e relation to the short arm of saidlever whereby the contact spring is caused to engage said rigid contactmember upon the actuation of such spoon shaped portion of said lever.

3. In a telephone receiver, a casing having an opening in the sidethereof, a knife edge fulcrum extending from one edge of the opening, anoperating lever having an arm extending within and an arm extendingwithout the casing, the arms being joined by an arcuate intermediateportion one surface of such portion resting on the knife edge fulcrumand another surface thereof slidably engaging the opposite edge of theopening, and a contact controlled by the lever.

l. In a telephone receiver, a casing having an opening in the wallthereof, a permanent magnet within the casing, a member mounted thereonand having a portion extending into the opening to provide a knife edgefulcrum, a lever having an arm extending within and an arm extendingwithout the casing, the arms being joined by an intermediate portion onesurface thereof resting on the fulcrum and another surface slidablyengaging one edge of the opening thereby cooperating with the fulcrummember to substantially fill the opening, and a plurality of contactmembers mounted on the permanent magnet and controlled by the lever.

5. In a telephone receiver, a casing having an opening in the wallthereof, a plate member mounted within the casin and hav ing a portionextending into the opening to provide a knife edge fulcrum, a leverhaving an arm extending within and an arm extending without the casing,the arms being joined by an intermediate portion resting on the fulcrumand cooperating with. the fulcrum member to substantially fill theopening, a resilient member to maintain the interiorly extending arm ofthe lever normally in engagement with the plate memher, and a contactcontrolled by the lever.

In witness whereof I hereunto subscribe my7name this 30th day ofOctober, A. D. 191

JAMES A. worron.

